velocity

Definitions

Interesting fact:
The anemometer is an instrument which measures the force, velocity, or pressure of the wind.

VelocityQuickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light.

Velocity(Mech) Rate of motion; the relation of motion to time, measured by the number of units of space passed over by a moving body or point in a unit of time, usually the number of feet passed over in a second. See the Note under Speed.

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Century Dictionary and Cyclopedia

Interesting fact:
The first manager of the Seattle Space Needle, Hoge Sullivan, was acrophobic - fearful of heights. The 605 foot tall Space Needle is fastened to its foundation with 72 bolts, each 30 feet long. The Space Needle sways approximately 1 inch for every 10 mph of wind. It was built to withstand a wind velocity of 200 miles-per-hour.

nvelocityThe velocity at which the mode of flow of a liquid, in a pipe or channel, is modified by the setting up of eddy-motion and the consequent interruption of the stream lines.

nvelocitySame as critical velocity .

nvelocityThe velocity of a given individual wave-length of light as opposed to the group velocity of a complex beam taken as a whole.

nvelocityQuickness of motion; speed in movement; swiftness; rapidity; celerity: used only (or chiefly) of inanimate objects. See def. 2.

nvelocityIn physics, rate of motion; the rate at which a body changes its position in space; the rate of change of position of a point per unit of time. The velocity of a body is uniform when it passes through equal spaces in equal times, and it is variable when the spaces passed through in equal times are unequal. The velocity of a body is accelerated when it passes constantly through a greater space in equal successive portions of time, as is the case with falling bodies under the action of gravity, and it is retarded when a less space is passed through in each successive portion of time. When the motion of a body is uniform its velocity is measured by the space described by it in a unit of time, as one second. If the motion of the body is not uniform its velocity is measured by the space which it would describe uniformly in a given time if the motion became and continued uniform from that instant of time.

nvelocityIn music, decided rapidity of tempo or pace, particularly in a bravura passage.

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Chambers's Twentieth Century Dictionary

Interesting fact:
The highest wind velocity ever recorded in the United States was 231 miles per hour, on Mount Washington, New Hampshire, in 1934.

nVelocityvē-los′i-ti swiftness: speed: rate of change of position of a point per unit of time

In science:

Is it the group velocity, the phase velocity, or the velocity of light in pure vacuum? As we have seen these quantities differ in the early universe in an essential way.

Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs

If we keep the deﬁnition of velocity as the derivative of the coordinate with respect to x0 , then the group velocity of the ﬁeld is given by the derivative of p0 with respect to p1 , and it is greater than the velocity of light.

Localized Propagating Tachyons in Extended Relativity Theories

Here u is an ob ject’s velocity observed in S , and u′ the velocity observed in S ′ , whereas v is the relative velocity between S and S ′ .

Localized Propagating Tachyons in Extended Relativity Theories

These dependences induce a net rotation in the radius-velocity plane between the correlations with effective radius and circular velocity in the disk galaxy progenitors, and the correlations with effective radius and velocity dispersion in the elliptical galaxy remnants.

The Effect of Major Mergers on Age and Metallicity Across the Fundamental Plane

However, the velocities from the WIYN/Hydra appear systematically 5–15 km s−1 more negative than velocities from WIRO for constant-velocity systems having suﬃcient data from both observatories to make this comparison.

A Fresh Catch of Massive Binaries in the Cygnus OB2 Association

The protostars have a broad distribution of radial velocities, ranging from vrad ∼ 1 km s−1 to vrad ∼ 100 km s−1 , and in many cases the radial velocity is greater than the escape velocity of the central region of the minihalo.

The First Stars

A particle has a velocity v at point (x, t) if it has previously changed its velocity at time t − τ and still is in the process of ﬂight with velocity v .

Space-time velocity correlation function for random walks

Nodal QPs have two velocities: the Fermi velocity vF and the gap velocity v∆ .

In addition, its optical velocity (though poorly known) differs from the ring velocity by over 350 km s−1 , suggesting a high impact velocity with respect to the ring.

The Head-on Collision between Two Gas-Rich Galaxies: Neutral Hydrogen Debris from the Centrally-smooth Ring Galaxy VIIZw466

Interior to the solar position at Ro , the tangent point (or terminal velocities) method produces accurate measurements (if the orbits are circular), but the velocities are measured relative to the local velocity vo and distances are expressed in units of Ro .

Does the Milky Way have a Maximal Disk?

Cloud positions and velocities, as well as subcloud velocities are produced by a random generator in a model data cube according to the speciﬁcations of the gas distribution, rotational ve locity, local velocity dispersion, scale height and projection parameters (position angle and inclination).

The faint end of the Tully-Fisher relation

The low velocity features appeared to be well correlated in HI emission and optical absorption, i.e., whenever the optical spectra showed a low velocity absorption feature (v< 10 km s−1 ), there was HI emission at the corresponding velocity.

The interstellar clouds of Adams and Blaauw revisited: an HI absorption study - I

Summary of coincident velocities: Column 2 lists the LSR velocities of all the optical absorption features seen in each line of sight (most of the listed velocities are from CaII observations).

The interstellar clouds of Adams and Blaauw revisited: an HI absorption study - I

Consequently, the one-dimensional version of this Hamiltonian perspective yields the important property that only two velocity states exist, one with velocity W and one with velocity −W .

The Levy diffusion as an effect of sporadic randomness

The idea is to tune the driving ﬁeld to resonance with the velocity group of atoms that moves in the direction opposite to the light pulse with velocity equal to the light group velocity that would be supported by this group of atoms if they were at rest.